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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947ee1748f17b98863b625285a881c9ac0c92b39461eee7e3d10b934630cf03a' 
  AND token = 'Awy41IvHyfnis4Ekl6BPG16+c4Gy23AHZlMYj2JmpIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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