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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c6f9d15364a57e192b9ab8654f28817cde5ddee97344b5750b482c8d4eb07a' 
  AND token = 'J4KzzLsZlopSRFFcOI5oWQ7Am49nyXmzV+M+IsHzecc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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