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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9136e8d8bdcc456f4822dc4bebada3f9099660c1fd6126605fc1d3f7572bfd' 
  AND token = 'ViVkC8rLfM2eoEmJIZscEUFKfh0o1H1ZDHUYPFWk/XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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