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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82ccc070a56d46e429870d79de9241be6b5e7417391368f90cca2ae1f7e80c3' 
  AND token = 'd1ud7asiVHAFHMXxtZqe/HXqBzaYrUK4qUcQdQ+J0Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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