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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0577070d9a3bba22b55a3ad97a5adbbe9ff7d8310e6815e032b9bbfd90735d' 
  AND token = 'BrLoDsBMuUYtD5/hKHM+CYkv46YSqM/U8RCHD5fHvP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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