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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da382e56667c30e0392233d6fbb07c363f9624d9b83511f295c9f51f76b626c' 
  AND token = 'oY+WscJatUh0PSjdpDKa6gcW6wbVug2ciT2Vb2yLjXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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