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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4db1a740590b6dcc83fd67b14ac94d9cc4cd4c2a4e8d70b26bfaa66553d7ec' 
  AND token = '0KQn2DtEVt4g+8ACFQefcemeOcjxDazUvFpArhXDo5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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