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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0617b757c8c7d2dd58aef769246be79f76ddcab64f69b569e1e3bb28c32d5cf6' 
  AND token = '0pBgVIUxFuUaIFYMVw1t7Ja9K9kfDSudu5a3v+TbSmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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