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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3448a566d58a19e452cdad40154cb853e079d12433805192825a36dd69479b85' 
  AND token = 'IHVNEJUNaTu0cbUwdRE9Nhe5lx4ByBNjFGI+yCfbBpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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