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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba19bc355b7ea5d7f71da4aaffef567e8eb79c083f76336204d9088e9690a0a' 
  AND token = 'AlPGGHUay7z8/uTcbBVkMiouCQf0MFK5RR+Dbs9bnCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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