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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb570a808a8bd520ea231cac8f81abd0b8e9bce748d827c487742a5dd3203eef' 
  AND token = 'KM7G743oqy1SXcjGW2JVuw5OhNuQ+67M2bK5/z5MS2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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