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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ca10706ccc081a9a201408d90675190d03b9a606f806618496a19f0f17ea30' 
  AND token = 'XZk/43Dy+yjoHxQykqx9twuMz+phs3XK8xHUCuyttYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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