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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a49f0fda08007cea1abfb8f37f929608ba1206829ed3761fae015a50cbd43e6c' 
  AND token = 'NiM6ffX+Y3Bu452VtA0MJzXcyWOd2ZI5dQhCmrIp8mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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