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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd49c01efd73741910aab7fe01d1a07d68cec783111abcd9af265eca49dd74c' 
  AND token = 'Zt/JDalfPIflqgYiHOCpqyzBSUpRdS+MilXP6J0v+ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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