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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e7ca2181e6b695e54ba1543d4eb5153c8e6f46ecd077a48ab4fa6d5f05b003' 
  AND token = 'o23YZ518aU5kVHON+jeC2xx1I5JaWcmAg1v7tmxNl4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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