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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b279f48c82121de187767d699d278f1df356af5e77ca8bfe1fe0ddfa4a6db381' 
  AND token = 'pwzzu94Rz8LIeLbcMUx9G3vWarvpymSKN05PAvkd2HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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