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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204550b1846b535e2311a606e80e62798e826455e5fd5bc3eeca7a8c1e7755f1' 
  AND token = 'f1zKnFKVAQZrvHngi3dNM9GS0tcDBftrR0tVB1Yqvto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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