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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43291835a9984cda2c811de6986ed6ccaf8bf81b0fd4d2dd71e7fb7fc4bc45f' 
  AND token = 'ecRqWiwz9PUtxA3/4fP/2nTniRpHkaMXpu99DDELFps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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