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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ae8c348ee8c8060840307954fade9d162bb4506f54b3a3a11b1daeff01bb09' 
  AND token = 'M9/36vUmLTuWIwnQcQWXCgsB57Zf4SlyFT7F9FwmF10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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