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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3988461fbd3839a86705f623ef6ab6b842931c4906c9d5c9ebad6c962dddf8b3' 
  AND token = 'w/kAsrwl34bN7MM+/bmrssFhCU69AapRF5Ty78IazfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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