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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a825fae6b94e59f76175aa4beab15820a1f2aa6ea763c37b65d7cfb00d9ff60b' 
  AND token = 'NlVpkwuPheEHu0z681iBUWX3DgctbiPd9HRsBgAmRrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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