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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd039bfbb3bbeba3ef763f10484c55a6dfbf1ad78ae85a3bf61e3a72b87cb0862' 
  AND token = 'hxkUgLmhb5CGCsHJIwKmvh6Aub7Wba7wgaJmHo/oBAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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