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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee69891d794ec914a52e30474126cf4399480ddf4f9925ae89ee62e529254f1b' 
  AND token = 'fPtwhcIfwEsjJOCjVWIJ7BOpkybGWxPVRa2X84vCcS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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