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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03da18b4f0d6772ba1589682aac1d1482d27e63a77dd122a51c40a6a411a2340' 
  AND token = 'y8sOLNiQTVwUgJv83vnq1whiG3LdGxISmKap4a+c+n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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