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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '399e583dfbb428e1197534722d6f0939290db00a14061e328a2f04852520f4bb' 
  AND token = 'zygFmSD5DwdjJKMANa++aQT0KGQnYbdxy6VKjCAKeeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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