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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a00b57952fcebf7e2eb894986d34a1c718be564682280c8e2e1bb0d6943684' 
  AND token = 'AEGo3UKt6BiGez2vTFwS+yzw/7g5CwMPkR1Cghf24z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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