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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f089459cd7dd40519e4e299ea7833d6bcab826c1a8599936173a3253fe7f3a' 
  AND token = 'qs+DuUnQ6JOdUbU6ihkqEkd6E/zLFr6wjjrUhO+xfks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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