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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9df7e4cb196f778c7bde032d336784a10077a8724b63df100057a90a92c28a' 
  AND token = '7Vm61oiZwAM/GbGiZZ5/iA1Ir5aCRr0Lfqe8ZAF7TqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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