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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c44abcaed697c4ef7aaba7d89f89137bdd1a7e3502d1e9d3e9c1eebda78fcb4' 
  AND token = 'r7fHbWWYiOpy8rvZ2eRINYMtQhz5GFCUieOcT5RLIKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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