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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b976db786c0a4ef05b2ffb6b6c10b9401008f341fbf9017a173be5b3ac47f3' 
  AND token = 'kXERmpElox3piO3QqZAUDN2ZlBUlnv+2tRZudKWQ3Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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