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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fdf309d396234f025af08d489ed05f57097cecc20bc93957fe2172583dda7f6' 
  AND token = '5j7LX0YYIpfB4YpYD3Cd42nSLIM2lRVVo3dufa9+B6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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