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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdc78f95d5e6b10a5c9daa2052791191d0c4a33b6ff5a3e9657e8629fb63864' 
  AND token = 'dtWyEKF+S6nDY12ozbawkeKwHfnMNxpHS1HHR+Zwhyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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