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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464026797b1c4c4e2149fd63e2938d5f4ae5eb307721169b52b6ee979ab7fcb6' 
  AND token = 'IZETENCNj/V7qshdo9dxCOnZ10rEF/3BIcG4YSNH1Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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