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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44018d29ea05670b99d1ec6b386f6f53c2f02d568a640ea328905172b3659a82' 
  AND token = 'C2Meq5Ntpv6lvyEW4S/nPQMs/HlqN5tcxZNKJzazKas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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