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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56592198753d5a6c2871722936dcbdb103abd7c01bea51e989634c320fbf11ac' 
  AND token = 'cBcrV1RM1gljHSYKodE4cF0v25Z9wFKVKb5P2y/2rvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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