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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8679f7a6040c2aa0b30b704699e1c6e324ebbcbe69346253db3b7ae5029c55f4' 
  AND token = '6yJE62c8zMUjdRl4CZbGYPkH9LbXedCJbqMgR6qOt/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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