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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3a8afbb222dde7eb08f73c883c3ff09002d638a1bf722bc6c6c29dc2a958e5' 
  AND token = '7FiSHyAyMwzfcUsUbxEayYOWvfpAVA2Y2/p1dvK8EpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}