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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fdc41235d8c920c05ae657ccbd537e14c324fdf27865bf71e0040a907d9cbc5' 
  AND token = 'eHNEjgDjgjtA+m09HzjQuVTxj8pfsXE9KO7ySuK6TcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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