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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23446194c976ab4f1ea718f1e832f02d8458cd8e8bf0c787ddf30f1fe687c17a' 
  AND token = 'aEZ/a4L5UBDMEnvLPo53eDzwQ84+7RzQ8tpcJ83KWKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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