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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050f237e89b2c4ef3d6c2836cba8fd4f3a890d8c878022c520952df659fd1409' 
  AND token = 'FJ23B41MTtB9Z00Rh7UzUZd4LhRp1S6ro6bu5wr5l1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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