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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246312859086ca67e55b164d8323817510a4b8e9f7048b27ef7dc2892eab15d0' 
  AND token = 'aos8d0Al4udKLc9KM4AspBiMpRjXX5pM/eBXNqIZ76E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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