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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7397a856047aec1f758ecef29da190e981b1cf72ddf2fb1c6c1b6cd8586519a5' 
  AND token = 'd+mEBgq2k0DjZmgONp3HIebqIz/5b32Had7Os1c6JHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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