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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003e8a06d38768c71612ea6f715b11d2953524903b12b5b4dea93dd43d591cbc' 
  AND token = 'KSvJGyi30MqGNFOTLNij0eC5zCSUoY/NU5zo00U3qYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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