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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2a6f26d8e0587b84c243e1ba0d5a1b5a327e94d2ce5f508ca55f9bbeac742e' 
  AND token = 'HmR55+fmidl8WWBSF7Ar7ltZt3JFqjRMlVKuWBSOF2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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