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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcd0469047c2d7e67a6c922ad66eceef5d15a5eb17257b2ee9a14a802adaf7f' 
  AND token = 'aki+W/6/2LNebFB9nGQec75WjZZmZYuEKo7En77La1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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