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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e51f63e51a29b23ce37f35d77037ffe3f51b34e93ff926fdf25f7ed5656d09db' 
  AND token = 'Y9WEw++1fJ5JhqFB75QTMRLC4Ti5ZwP+je4iHkRb4Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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