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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808b44b15214c1df62076943fa1d60af463570341bd4c88e424ae45b501c1f03' 
  AND token = '9u4oNnzbvJ0ASWFF+ReZo73WjgB5wS4Gv+3gLBBS3fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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