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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d603358a332c6357ef086d756ee1fccab2d0ed0865f786b008482cd2ed87f7' 
  AND token = 'uWs0YXHR159mF7t7Yufpw9M9CnuowZ0xRl8OGBkPmfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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