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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cafb3e9dab1e1ee25c489e1f77cf1ad3d343bda0069b8b09f8a8f61b500e0ea0' 
  AND token = 'LJtEfHSyQ1TW6FrAfwm9Esa+adsYNGQlNnLZUZ0W9Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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