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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a79c90bf82eeaa82ad59bda7c5d692e100c4c05f2d847bb627053089830a2b' 
  AND token = 'X7FbBP1gC9V8X3JFOqgPc17NP7yaZsVuKCgTUdAwXe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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