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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5d5b648a68aa9b929c6bc4df448189eefc1ff769d77bd5706bc4e4768a26d7' 
  AND token = 'H8f+7nMlMDL27zUC58Fjx3vOY16dkK+1Y7WG28oE/TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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