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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec34d8c7ac7c020ae8d9c658778c3fe867dd4fe87d979fc4cb690f7a5be26b7' 
  AND token = 'yZL2whDU2C6btW1XtHR9ycM3hoE5ZWUIgXQbI9xVYk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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