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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889c528eb38bfb1e7ebdd7e126552511ff49c35a53e8597833b5d6e9817004a9' 
  AND token = 'MWAFq1jsojPTVCadfAd23gJB0Le+EUQIWJB6xwbdMMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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