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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5256467265a81f70764a59e9bdc6fc7f1957cff0595b59bf0516cfe71809136' 
  AND token = 'sYVLMTQBDDRg8yAyK3Hc9PgE/YykDZs8X1anFSihU2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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