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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd095eb400a385e739478c549553e3cb096a472fb4a745d2cb85906450c32b8' 
  AND token = 'xF6PSUAKnmg0sUMYoZaAJ3HrZqnkaGk8aXpVKpezK2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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