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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c0bba4ace425ce7d4eefc25f18f5a175747fee31e8809f16f1ff8b76d82b85' 
  AND token = 'IateZcFErM2r2GaL82/ncjXaZo4JYuJUnXQjBLJcOEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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