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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791dd39b4ed7a19f0dc407b26e99c30b6895714a945578fc8af208265ee58eb5' 
  AND token = 'wKMPFGz5TB77iE45sbNuWXLTlUTse5pIvIwzx0IhWzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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