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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f90fdc4eba5cb0bd39d26a6baf9f36f59558c05bd9375db276ec5cb68fc0731' 
  AND token = 'sA5Jrs0WTOzxvTyTFMybUPt0Itdoc+fch8Tf7Unld7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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