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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d0522990cec9452f109b8c740e51f720981976c2ea22ebb5b9e8bdb7eff5c4' 
  AND token = '9TvhYu6CDpZ9r1hVw17a4OopOjSlG5vh8jYJKNGkrKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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