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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad40ec7394e40087013f078801fa04602288943041b2ecd4e1a1f920d79b2ea' 
  AND token = 'zpLgfmFcpgLtK4OhCQghFjEaF/XND1l5chxOSqDQZOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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