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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb1b63f7864e994a0bfe5d943b3b44cd396f6c3c3ed83820936ebecec5f3ee9' 
  AND token = 'PWEvr4xNOx8gvS7wxKPxg+cOY2WwORXO48WIbvmCoBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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