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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711c23784baf10277b63d3e09d7dff6f4cbfa6ecf12622723b49684c0210319b' 
  AND token = 'iVA8aTZcG6viSGz7ZfUkHDutQZy7C731isFTP2GTigA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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